Apparatus for determining the moment when a ship&#39;s gun passes through a predetermined elevation.



L. J. MA'UTNER. NG THE MOMENT WHEN A SHIPS GUN P PREDETBRMINED ELEVATION. APPLICATION TILED APR 3, 1912.

AVSSBS THROUGH A APPARATUS FOR DETERMINI Patented Aug. 6,1912.

LUDWIG .rosnr MAUTNEB, or vI'En'NA, AUSTRIA-meant.

I 'nrram'rus roansrnaumme THE Home! WHEN a sales GUN rAssEs ri nouen A PREDETERMINED ELEVATION.

' Specification of Letters Patent.

Application filed April 3,1912. Serial No; 685,231.

Tool! whom. may concern:

Be it known that I, LUnWIo J osnF MAUT- ran, a subject of the Emperor of Austria- Hungary, residing at Vienna, Empire of Austria-Hungary, hai s invented certain new and useful Improvements in Apparatus for Determining the Moment when a Ships Gun Passes Through a Predetermined Elevation; and I'do hereby declare'the following to be a full, clear, and exact description of the invention, such as will enable others .ski'lledin the art to which it appertains to make and use the same In a known apparatus for determining the momcnt when a ships gun passes through a predetermined elevation a slide having straight parallel lines drawn on it is adjustable along an arc of a circle adapted,

to turn around an axis permanently parallel to the axis of the bore of the gun such axis being mounted on a portion of the gun car riage not taking part in the recoil. The arrangement of the parts is such that the said straight parallel lines are vertical when the arc is in a vertical plane, the ship is on an even keel and the gun has the predetermined elevation corresponding to. the adjustment of the slide on the are. A plumb line is suspended on the slide or on the arc so'that when the ship rolls the moment when the gun passes through the elevation corresponding to the adjustment of the slide on the are; is indicated by the fact that the plumb line' becomes parallel to the lines drawn on the slide. The are -is held in a. vertical plane by hand. According to the-present invention this apparatus is im- -proved in the direction that for the plumb line a ball, roller or other solid-of revolution is substituted which is compelled to move along a guide in the form of an arc of a circle, such are being held in a vertical .plane. The solid of -revolution therefore moves under exactly thesame conditions as if it were attached to a wire or cord suspended 'in the center. of the arc shaped uide and thus did constitute a plumb line, ut the wire or cord is dis ensed with. Thereby the space required fort e apparatus is reatl-y reduced and its strength notably in r ase Atfthe moment when the gun asses through the predetermined elevation he solid of 'i'etiolutiojn" comes exactly/in front of the slide! which oonstitutesa c0111 I I i" 4 vvenient and reliable means for accurately ascertaining this moment. i I x In the drawing by way of example a con structional form of the apparatus embody .ing this invention is shown in Figure 1 in side elevation and in i 2 in transverse section on the line A B, l ig. l. y l

A shaft 2 permanently parallel to the axis of-the bore of the gun is journaled in a frame 1 secured to a portion of the un carriage not taking part in the reco' .--.This

Patented Aug. 6, 191 2. 7

shaft carries a guide 15, '16, 17 in the form of an arc of acircle alon whicha ball 12 or a roller or other soli vfree 'to move. Along a raduated are 3 provided on the guide a ide 6 is adjustable.

By properly turning the guide around the geometrical aids of the shaft 2i ;th9 plane of.

such guide can be maintained verticalat all times notwithstanding any rolling or other oscillatory movements of the shi and this vertical plane is then also para lel to the vertical plane through the axis of the bore of the gun '(that is to say to the lane .of

of revolution is the trajectory of the projectile, if eviation is neglected): The geometrical axis of the are shaped guide is then horizontal and nornial to this plane. The slide fi is ad, justed on the graduated are 3 according 'to the elevation desired, that is to say so that this slide is at the lowest point of the graduated are when the plane of the are shaped guide isvertical and the shaft 2 and therefore also the axis of thelbore on the gun makes the desired an 1c of elevation with the horizon. -Hence w "en the ship oscillates the slide 6 will. move to-and from front of the ball 12 which is always at the lowest point of the are shapedguide. Therefore form of a fork or other suitable form or it may be provided with a hair cross,

a The ball rolleror other solid of revolution may repose on the-ere shaped uide simply owing to gravity But it is pre erred to suspend it me etically as shown in the drawing, ole pieces 15, 16' of a magnet all roller or other solid of revolution-the u per part of the slide may be made in t e- .core 14 w ich are curved on an 'arc of a circle and located side by side holding attracted the ball roller or other solid of revolution which then consists of iron.- 18 indicates a coil on the core 14 and serving for magnetizing the same. In any case the guide the ball, roller or other solid of revolution from falling out 111 the event of shocks. Besides when the magnetic suspension above described is used care must be taken that the ball, roller or other solid of revolution even if it should fall down from the pole a predetermined e euation the combinamust be so shaped that it prevents tion of a guide shaped to the are of a circle and adapted to turn around an axis parallel to the axis of the bore of the gun,a solid of revolution adapted to roll f1 ely along such guide under the action of gravity and a slide adjustablealong such wide, substantially as and 'for thepurpose described.

3. In an apparatus for dct e-is'nining the moment when a ships gun passes through-a predetermined elevation, the combinationnf a magnet having pole pieces located side by side parallel to each other and curved to the arc of a circle; whereby they constitute a guide, such magnet and guide being adapted to turn around an axis parallel to the axis of the bore of the gun a magnetic solid of revolution adapted to be held attracted by such guide and to move freely along such uide under the action of gravity and a slide adjustablealong such guide, substantially and for the purpose described.

In testimony whereof, I atlix my signature, in presence of two witnesses.

LUDVVIG J OSEF MAUT-NER. W'itnesses: 1

ARTHUR BAUMANN, ADA MAnIaBEnGnn. l 

